Implement saving+loading the game

Implement ToJSON and FromJSON for all of the various pieces of the game
state, and add a pair of functions saveGame/loadGame implementing a
prism to save the game as zlib-compressed JSON. To test this, there's
now Arbitrary, CoArbitrary, and Function instances for all the parts of
the game state - to get around circular imports with the concrete
entities this unfortunately is happening via orphan instances, plus an
hs-boot file to break a circular import that was just a little too hard
to remove by moving things around. Ugh.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/Xanthous/Entities/Item.hs b/src/Xanthous/Entities/Item.hs
index ea6f16e05d..ddd387af8c 100644
--- a/src/Xanthous/Entities/Item.hs
+++ b/src/Xanthous/Entities/Item.hs
@@ -29,13 +29,15 @@ data Item = Item
   { _itemType :: ItemType
   }
   deriving stock (Eq, Show, Generic)
-  deriving anyclass (CoArbitrary, Function)
+  deriving anyclass (NFData, CoArbitrary, Function)
   deriving Draw via DrawRawChar "_itemType" Item
   deriving (ToJSON, FromJSON)
        via WithOptions '[ FieldLabelModifier '[Drop 1] ]
                        Item
 makeLenses ''Item
 
+{-# ANN Item ("HLint: ignore Use newtype instead of data" :: String )#-}
+
 -- deriving via (Brainless Item) instance Brain Item
 instance Brain Item where step = brainVia Brainless